Oil-immersed transformer heat dissipation oil channel structure

Abstract

The utility model discloses an oil-immersed transformer heat dissipation oil channel structure, including transformer body, oil pillow, fin and connect in the oil inlet pipe and oil return pipe of transformer body, and are equipped with flow self -adaptation adjusting device in oil inlet pipe and oil return pipe, and this device includes valve seat subassembly, temperature response drive mechanism and elastic mechanism, and the valve core in valve seat subassembly can move in the fluid passage to adjust the flow area, temperature response drive mechanism utilizes paraffin wax expansion body and drives valve core movement to respond oil temperature, and elastic mechanism provides the reset force, the utility model discloses through paraffin wax expansion body drive valve core opening degree, has realized the self -adaptation adjustment of heat dissipation oil flow with transformer load and temperature, and effectively solved the problem of high load heat dissipation deficiency and low load energy consumption redundancy.

Description

Technical Field

[0001] This utility model belongs to the field of transformer technology, and in particular relates to a heat dissipation oil channel structure for an oil-immersed transformer. Background Technology

[0002] Oil-immersed transformers generally use insulating oil as the cooling medium. The oil inlet pipe, oil return pipe and heat sink form a circulating heat dissipation circuit. The heat generated inside the transformer is carried out and dissipated to the external environment by the natural convection or forced circulation of the insulating oil.

[0003] However, existing cooling oil channel structures have a significant inherent drawback: the flow area of ​​their oil channels is a fixed geometric dimension and cannot be adjusted. This static design leads to a severe mismatch between the heat dissipation capacity and the dynamic requirements of the transformer's actual operating conditions. Insufficient heat dissipation under high load: When a transformer is operating under high load or in a high-temperature environment, the internal heat generation increases sharply. The fixed flow channel restricts the circulation flow and speed of the cooling oil, making it impossible to remove the accumulated heat in time. This can easily cause the transformer oil temperature to rise continuously, forming local overheating hot spots. This not only accelerates the aging of the insulation material, but also threatens the safe operating life of the transformer. Energy redundancy at low loads: Conversely, under low load conditions or when the ambient temperature is low, the transformer itself generates less heat. In this case, the fixed maximum flow area leads to excess cooling oil flow, resulting in unnecessary energy loss of the oil pump drive and reducing the overall operating efficiency of the transformer.

[0004] Therefore, the existing technology lacks an oil channel structure that can automatically and accurately adjust its own heat dissipation capacity according to the real-time thermal load status of the transformer, making it difficult to achieve a balance between ensuring heat dissipation efficiency and reducing operating energy consumption. To solve the above problems, an oil-immersed transformer heat dissipation oil channel structure is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a heat dissipation oil channel structure for an oil-immersed transformer, thereby solving the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model discloses a heat dissipation oil channel structure for an oil-immersed transformer, comprising a transformer body, an oil conservator, and heat sinks. An oil inlet pipe and an oil return pipe are fixedly installed on one side of the transformer body. The oil conservator is connected to the oil inlet pipe via a first connecting pipe and to the oil return pipe via a second connecting pipe. Both the oil inlet and return pipes are equipped with adaptive flow control devices. The adaptive flow control device includes a valve seat assembly, a temperature-responsive drive mechanism, and an elastic mechanism. A fluid channel is formed at the center of the valve seat assembly. The valve seat assembly is movably disposed within the fluid channel to adjust the flow area of ​​the fluid channel. The drive output end of the temperature-responsive drive mechanism is connected to the valve seat assembly so that when the oil temperature rises, the valve seat assembly is driven to move against the biasing force of the elastic mechanism, thereby increasing the flow area. The elastic mechanism provides a reset support force for the valve seat assembly, thereby reducing the flow area.

[0007] Preferably, the valve seat assembly includes a valve core, a push rod, and a flow regulating ring. One end of the push rod is fixedly connected to the valve core, and the other end is connected to an elastic mechanism. The flow adaptive regulating device also includes a rotary cleaning mechanism. The rotary cleaning mechanism causes the push rod to rotate synchronously when it moves axially, and drives the valve core and the valve seat assembly to generate relative rotational friction, thereby achieving self-cleaning.

[0008] Preferably, the rotating cleaning mechanism includes a limiting rod fixedly installed inside the pipe and a spiral guide groove formed on the periphery of the push rod. The end of the limiting rod is embedded in the spiral guide groove. When the push rod moves axially, the push rod is forced to rotate through the cooperation of the limiting rod and the spiral guide groove.

[0009] Preferably, the inner wall of the flow regulating ring is fixedly provided with a plurality of cleaning plates, the cutting edge of the cleaning plate being adapted to the spherical surface of the valve core.

[0010] Preferably, the elastic mechanism includes a guide frame fixed inside the pipe, a guide rod fixed on the guide frame, a push plate slidably sleeved on the guide rod, and a spring sleeved on the guide rod. The two ends of the spring abut against the guide frame and the push plate, respectively, and the push rod is rotatably connected to the push plate.

[0011] Preferably, the temperature response drive mechanism includes a mounting bracket fixed inside the pipe; a mounting cylinder fixed on the mounting bracket, the mounting cylinder encapsulating an expansion substrate and a connecting plate fixedly connected to the expansion substrate, and at least one retracting rod fixedly connected to the connecting plate, the end of the retracting rod abutting against the push rod.

[0012] Preferably, the material of the expanded matrix is ​​paraffin wax.

[0013] Preferably, the valve core has a hemispherical structure.

[0014] This utility model has the following beneficial effects: This invention achieves dynamic and precise matching between heat dissipation capacity and heat load, fundamentally solving the inherent problems of traditional designs. Regarding insufficient heat dissipation under high loads: a temperature-sensing drive mechanism (paraffin expansion body) monitors oil temperature in real time. When the oil temperature rises, the valve core opens wider, increasing the flow area and oil flow rate, significantly improving peak heat dissipation capacity, effectively preventing transformer overheating, and ensuring safe operation of the equipment under heavy loads. Regarding energy redundancy under low loads: in low-temperature or light-load conditions, the valve automatically closes under the action of the elastic mechanism, reducing oil flow rate, thereby directly reducing the flow resistance work that the oil pump needs to overcome to drive the oil flow, achieving significant energy-saving effects and improving the transformer's operational economy. This invention enables the valve core to achieve a self-cleaning function, improving the long-term operational stability of the equipment. Specifically, by setting a threaded guide groove on the circumferential side of the push rod to cooperate with the limit rod, the axial movement of the valve core is converted into rotational motion. This allows the valve core to generate circumferential friction with a fixed cleaning scraper during each opening and closing process, automatically scraping away and grinding solid impurities such as oil stains and carbon deposits that may adhere to the sealing ball surface of the valve core. This effectively solves the problems of valve core jamming and incomplete closure caused by impurity deposition, ensuring the long-term reliability of the adaptive adjustment function and reducing maintenance requirements.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial cross-sectional view of the oil inlet pipe and oil return pipe of this utility model. Figure 3 This is a schematic diagram of the internal structure of the oil inlet pipe and oil return pipe of this utility model; Figure 4 This is a cross-sectional structural schematic diagram of the flow regulating mechanism of this utility model; Figure 5 This is a cross-sectional view of the temperature sensing drive mechanism of this utility model. Figure 6 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0018] The components represented by each number in the attached diagram are listed below: 1. Transformer body; 2. Oil conservator; 3. Heat sink; 4. Oil inlet pipe; 5. Oil return pipe; 6. First connecting pipe; 7. Second connecting pipe; 8. Flow regulating ring; 9. Guide frame; 10. Guide rod; 11. Spring; 12. Push plate; 13. Mounting bracket; 14. Push rod; 15. Valve core; 16. Cleaning plate; 17. Mounting cylinder; 18. Retracting rod; 19. Limiting rod; 20. Expansion base; 21. Connecting plate. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "upper", "middle", "outer", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Please see Figures 1-6 As shown, this utility model is a heat dissipation oil channel structure for an oil-immersed transformer, including a transformer body 1, an oil conservator 2 and a heat sink 3. An oil inlet pipe 4 and an oil return pipe 5 are fixedly provided on one side of the transformer body 1, which together form the main circulation channel for the heat dissipation oil. The oil conservator 2 is connected to the oil inlet pipe 4 through a first connecting pipe 6 and to the oil return pipe 5 through a second connecting pipe 7, in order to compensate for the volume expansion and contraction of the insulating oil due to temperature changes. Both the inlet pipe 4 and the return pipe 5 are equipped with flow adaptive adjustment devices. The flow adaptive adjustment devices include a valve seat assembly, a temperature response drive mechanism, and an elastic mechanism. The valve seat assembly is the main functional body for performing flow adjustment. Its core includes a flow adjustment ring 8 fixed in the pipe. A fluid channel is formed in the center of the ring. A hemispherical valve core 15 serves as an opening and closing element and is axially movable in the fluid channel. The valve core 15 is connected to the drive and reset mechanism through a push rod 14. One end of the push rod 14 is fixedly connected to the valve core 15, and the other end is rotatably connected to the elastic mechanism behind it. In addition, several cleaning plates 16 are fixedly embedded on the inner wall of the flow adjustment ring 8. The shape of their cutting edges is precisely matched with the hemispherical outer surface of the valve core 15 and is used to scrape and clean the valve core 15 when it rotates. The elastic mechanism provides a constant closing bias force for the valve core 15 and ensures the stability of its movement. It mainly includes a guide frame 9 fixed inside the pipeline, a guide rod 10 fixedly installed on the guide frame 9, a spring 11 and a push plate 12 sequentially sleeved on the guide rod 10, the push plate 12 can slide along the guide rod 10, the two ends of the spring 11 abut against the guide frame 9 and the push plate 12 respectively, and the end of the push rod 14 is rotatably connected to the push plate 12 through a bearing, which allows the push rod 14 and the valve core 15 to rotate freely while being pushed.

[0022] The temperature response drive mechanism is responsible for converting the temperature signal into mechanical action. It includes a mounting bracket 13 fixed inside the pipe, a mounting cylinder 17 fixed on the mounting bracket 13, and a paraffin-material expansion substrate 20 sealed inside the mounting cylinder 17. A connecting plate 21 is fixedly connected to one end of the expansion substrate 20, and at least one retraction rod 18 is fixedly connected to the connecting plate 21. The end of the retraction rod 18 extends out and forms a transmission abutment with the side or end of the push rod 14.

[0023] The rotary cleaning mechanism is key to achieving the self-maintenance function. It is not a separate component, but a mechanism formed by the cooperation of the push rod 14 and the fixed component. A spiral guide groove is machined on the peripheral side of the push rod 14. At the same time, a limiting rod 19 is fixedly installed inside the pipe. The end of the limiting rod 19 is embedded in the spiral guide groove. When the push rod 14 moves axially due to driving or resetting, it will be forced to rotate around its own axis through the cooperation of the limiting rod 19 and the spiral groove, causing it to drive the valve core 15 to rotate. During the rotation, it comes into contact with the cleaning plate 16. The cleaning plate 16 scrapes the surface of the valve core 15, thus cleaning the valve core 15.

[0024] Working principle: When the transformer body 1 is started or in a light-load, low-temperature environment, the temperature of the insulating oil flowing through the inlet pipe 4 and the return pipe 5 is low. At this time, the paraffin expansion matrix 20 in the temperature response drive mechanism is in a solid or slightly expanded state, and does not generate or generates very little thrust on the retraction rod 18. In the elastic mechanism, the preload of the spring 11, through the push plate 12 and the push rod 14, presses the hemispherical valve core 15 against and tightly fits it against the valve seat of the flow regulating ring 8, so that the flow area of ​​the fluid channel is kept to a minimum. This design ensures that under low load, the oil flow resistance is large and the flow rate is limited to the level that meets the basic heat dissipation requirements, reducing the operating energy consumption of the oil pump. When the load of the transformer body 1 increases or the ambient temperature rises, causing the insulating oil temperature to rise, the high-temperature oil flows through the mounting cylinder 17, causing the expansion matrix 20 inside to melt and expand violently. The pressure generated by the expansion pushes the connecting rod 18. The connecting plate 21 then applies a thrust to the push rod 14 via the retraction rod 18. This thrust overcomes the elastic force of the spring 11, pushing the entire push rod 14 and valve core 15 to move away from the flow regulating ring 8. The departure of the valve core 15 causes the annular flow area of ​​the fluid channel to gradually increase, the oil flow resistance to decrease, and the circulating oil flow rate to increase significantly, thereby greatly improving the cooling capacity of the heat dissipation system. Since the spiral groove on the push rod 14 cooperates with the fixed limiting rod 19, the push rod 14 is forced to rotate while moving axially. This causes the valve core 15, which is fixedly connected to the push rod 14, to rotate together. During the rotation, the hemispherical surface of the valve core 15 generates continuous circumferential scraping friction with the cutting edge of the cleaning plate 16 fixed to the inner wall of the flow regulating ring 8. This action can automatically and effectively scrape away impurities such as oil stains and carbonized particles that may adhere to the sealing surface of the valve core 15.

[0025] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A heat dissipation oil channel structure for an oil-immersed transformer, comprising a transformer body (1), an oil conservator (2), and heat sinks (3), wherein an oil inlet pipe (4) and an oil return pipe (5) are fixedly provided on one side of the transformer body (1), and the oil conservator (2) is connected to the oil inlet pipe (4) through a first connecting pipe (6) and to the oil return pipe (5) through a second connecting pipe (7), characterized in that: Both the inlet pipe (4) and the return pipe (5) are equipped with flow adaptive adjustment devices; The flow adaptive regulation device includes a valve seat assembly, a temperature response drive mechanism, and an elastic mechanism, wherein a fluid channel is formed at the center of the valve seat assembly; The valve seat assembly is movably disposed in the fluid channel for adjusting the flow area of ​​the fluid channel; The drive output end of the temperature response drive mechanism is connected to the valve seat assembly so that when the oil temperature rises, the valve seat assembly is driven to move against the biasing force of the elastic mechanism, thereby increasing the flow surface. The elastic mechanism provides a reset support force for the valve seat assembly, thereby reducing the flow surface.

2. The oil-immersed transformer oil duct structure according to claim 1, characterized in that, The valve seat assembly includes a valve core (15), a push rod (14), and a flow regulating ring (8). One end of the push rod (14) is fixedly connected to the valve core (15), and the other end is connected to an elastic mechanism. The flow adaptive regulating device also includes a rotary cleaning mechanism. The rotary cleaning mechanism causes the push rod (14) to rotate synchronously when it moves axially, and drives the valve core (15) and the valve seat assembly to generate relative rotational friction, thereby achieving self-cleaning.

3. The oil-immersed transformer oil duct structure according to claim 2, characterized in that, The rotating cleaning mechanism includes a limiting rod (19) fixedly installed in the pipe and a spiral guide groove opened on the periphery of the push rod (14). The end of the limiting rod (19) is embedded in the spiral guide groove. When the push rod (14) moves axially, the push rod (14) is forced to rotate by the cooperation of the limiting rod (19) and the spiral guide groove.

4. The oil-immersed transformer oil duct structure according to claim 3, characterized in that, The inner wall of the flow regulating ring (8) is fixedly provided with a number of cleaning plates (16), and the cutting edge of the cleaning plate (16) is adapted to the spherical surface of the valve core (15).

5. The oil-immersed transformer oil duct structure according to claim 2, characterized by The elastic mechanism includes a guide frame (9) fixed inside the pipe, a guide rod (10) fixed on the guide frame (9), a push plate (12) slidably sleeved on the guide rod (10), and a spring (11) sleeved on the guide rod (10). The two ends of the spring (11) abut against the guide frame (9) and the push plate (12) respectively, and the push rod (14) is rotatably connected to the push plate (12).

6. The oil-immersed transformer oil duct structure according to claim 5, characterized in that, The temperature response drive mechanism includes a mounting bracket (13) fixed inside the pipe; a mounting cylinder (17) fixed on the mounting bracket (13), an expansion substrate (20) encapsulated inside the mounting cylinder (17) and a connecting plate (21) fixedly connected to the expansion substrate (20), at least one retraction rod (18) fixedly connected to the connecting plate (21), and the end of the retraction rod (18) actuating with the push rod (14).

7. The oil-immersed transformer oil duct structure according to claim 6, characterized by The expanded matrix (20) is made of paraffin wax.

8. The oil-immersed transformer oil duct structure according to claim 4, characterized by The valve core (15) has a hemispherical structure.

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